weight,height=eval(input("请输入您的体重和身高："))
BMI=(weight/(height*height))
if BMI<18.5:
    print("过轻")
elif BMI<25:
    print("正常")
elif BMI<28:
    print("过重")
elif BMI<32:
    print("肥胖")
else:
    print("严重肥胖")
